Journal ArticleDOI
Graphene-Based Ultracapacitors
TLDR
CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here their performance in an ultracapacitor cell is demonstrated, illustrating the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.Abstract:
The surface area of a single graphene sheet is 2630 m2/g, substantially higher than values derived from BET surface area measurements of activated carbons used in current electrochemical double layer capacitors. Our group has pioneered a new carbon material that we call chemically modified graphene (CMG). CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here we demonstrate in an ultracapacitor cell their performance. Specific capacitances of 135 and 99 F/g in aqueous and organic electrolytes, respectively, have been measured. In addition, high electrical conductivity gives these materials consistently good performance over a wide range of voltage scan rates. These encouraging results illustrate the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.read more
Citations
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Journal ArticleDOI
Recent Advances in Design and Fabrication of Electrochemical Supercapacitors with High Energy Densities
TL;DR: In this paper, the authors reviewed several key issues for improving the energy densities of supercapacitors and some mutual relationships among various effecting parameters, and challenges and perspectives in this exciting field are discussed.
Journal ArticleDOI
Graphene-Wrapped Fe(3)O(4) Anode Material with Improved Reversible Capacity and Cyclic Stability for Lithium Ion Batteries
Guangmin Zhou,Dawei Wang,Feng Li,Lili Zhang,Na Li,Zhong-Shuai Wu,Lei Wen,Gao Qing Lu,Hui-Ming Cheng +8 more
TL;DR: Li et al. as discussed by the authors proposed a method for Chinese Academia, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd., Shenyang 110016, Peoples R China.
Journal ArticleDOI
Graphene based new energy materials
Yiqing Sun,Qiong Wu,Gaoquan Shi +2 more
TL;DR: Graphene, a one-atom layer of graphite, possesses a unique two-dimensional (2D) structure, high conductivity and charge carrier mobility, huge specific surface area, high transparency and great mechanical strength as mentioned in this paper.
Posted Content
Review of Best Practice Methods for Determining an Electrode Material's Performance for Ultracapacitors
Meryl D. Stoller,Rodney S. Ruoff +1 more
TL;DR: In this paper, the authors review the best practice test methods that accurately predict a materials performance, yet are flexible and quick enough to accommodate a wide range of material sample types and amounts.
Journal ArticleDOI
Simultaneous Nitrogen Doping and Reduction of Graphene Oxide
TL;DR: The N-doped reduced GO shows clearly n-type electron doping behavior with the Dirac point (DP) at negative gate voltages in three terminal devices, and electrical measurements of individual GO sheet devices demonstrate that GO anneal in NH(3) exhibits higher conductivity than those annealed in H(2), suggesting more effective reduction of GO by annealing in NH-3 than in H-2, consistent with XPS data.
References
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Journal ArticleDOI
Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide
Sasha Stankovich,Dmitriy A. Dikin,Richard D. Piner,Kevin A. Kohlhaas,Alfred Kleinhammes,Yuanyuan Jia,Yue Wu,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: In this paper, a colloidal suspension of exfoliated graphene oxide sheets in water with hydrazine hydrate results in their aggregation and subsequent formation of a high surface area carbon material which consists of thin graphene-based sheets.
Journal ArticleDOI
Graphene-based composite materials
Sasha Stankovich,Dmitriy A. Dikin,Geoffrey Dommett,K. Kohlhaas,Eric Zimney,Eric A. Stach,Richard D. Piner,SonBinh T. Nguyen,Rodney S. Ruoff +8 more
TL;DR: The bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.
Journal ArticleDOI
Processable aqueous dispersions of graphene nanosheets
TL;DR: It is reported that chemically converted graphene sheets obtained from graphite can readily form stable aqueous colloids through electrostatic stabilization, making it possible to process graphene materials using low-cost solution processing techniques, opening up enormous opportunities to use this unique carbon nanostructure for many technological applications.
Journal ArticleDOI
Preparation and Characterization of Graphene Oxide Paper
Dmitriy A. Dikin,Sasha Stankovich,Eric Zimney,Richard D. Piner,Geoffrey Dommett,Guennadi Evmenenko,SonBinh T. Nguyen,Rodney S. Ruoff +7 more
TL;DR: Graphene oxide paper is reported, a free-standing carbon-based membrane material made by flow-directed assembly of individual graphene oxide sheets that outperforms many other paper-like materials in stiffness and strength.
Book
Electrochemical Supercapacitors : Scientific Fundamentals and Technological Applications
TL;DR: In this paper, the double-layer and surface functionalities at Carbon were investigated and the double layer at Capacitor Electrode Interfaces: its structure and Capacitance.